# 15506648364351737979017.jpgA field of 5x104/ $\pi$ ampere - turns/meter acts at right angle to a coil of 50 turns of area 10-2 m2. The coil is removed from the field in 0.1 sec. then the emf indused in the coil is

$emf=\frac{d\phi }{dt}=\frac{BNA}{t}$